Heater



FIG. 1 is a top, front, right isometric view of a heater;

FIG. 2 is a rear side view of FIG. 1;

FIG. 3 is a front side view of FIG. 1;

FIG. 4 is a left view of FIG. 1;

FIG. 5 is a right side view of FIG. 1;

FIG. 6 is a top side view of FIG. 1; and,

FIG. 7 is a bottom view of FIG. 1.

In the drawings, the broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM An ornamental design for a heater, as shown and described. 